One vertex per element, one color per generator, with an edge from x to x·s.
(3,7)(6,8)(9,10,14,16)(11,15,12,17)(13,21,22,18)(19,24,20,23)(25,26,32,35)(27,36,31,33)(28,30,29,34)(37,39,38,40)(1,2)(3,6)(4,5)(7,8)(9,11)(10,15)(12,14)(13,19)(16,17)(18,23)(20,22)(21,24)(25,27,32,31)(26,33,35,36)(28,38,29,37)(30,39,34,40)(2,5)(6,8)(10,16)(11,12)(18,21)(19,20)(25,28,32,29)(26,34,35,30)(27,37,31,38)(33,39,36,40)(1,2)(3,6)(4,5)(7,8)(9,12,14,11)(10,17,16,15)(13,20,22,19)(18,24,21,23)(25,29,32,28)(26,30,35,34)(27,38,31,37)(33,40,36,39)(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,17)(13,18)(14,16)(19,23)(20,24)(21,22)(25,30)(26,28)(27,39)(29,35)(31,40)(32,34)(33,38)(36,37) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,13,14,22)(10,18,16,21)(11,19,12,20)(15,23,17,24)(25,31,32,27)(26,33,35,36)(28,38,29,37)(30,40,34,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.